diff --git a/composer.json b/composer.json
index ffb3dfb..620941b 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
-        "guzzlehttp/guzzle": "^6.2"
+        "guzzlehttp/guzzle": "^6.2 || ^7.0",
+        "guzzlehttp/psr7": "^1.8"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7",
diff --git a/lib/api/AuthApi.php b/lib/api/AuthApi.php
index 23dc828..64d5b8d 100644
--- a/lib/api/AuthApi.php
+++ b/lib/api/AuthApi.php
@@ -327,7 +327,7 @@ protected function obtainTokensRequest($grant_type, $password = null, $refresh_t
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -348,7 +348,7 @@ protected function obtainTokensRequest($grant_type, $password = null, $refresh_t
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/api/FileTokensStorageApi.php b/lib/api/FileTokensStorageApi.php
index 04c32ad..549e663 100644
--- a/lib/api/FileTokensStorageApi.php
+++ b/lib/api/FileTokensStorageApi.php
@@ -26,8 +26,6 @@ public function __construct($host, $terminalCode)
     {
         $this->validateInputParams($terminalCode);
 
-        $this->terminalCode = $terminalCode;
-
         $configuration = new Configuration($host);
         $tempFolderPath = $configuration->getTempFolderPath();
 
diff --git a/lib/api/LimitsApi.php b/lib/api/LimitsApi.php
index 602080d..c318ad3 100644
--- a/lib/api/LimitsApi.php
+++ b/lib/api/LimitsApi.php
@@ -318,7 +318,7 @@ protected function getLimitsInfoRequest($request_id = null)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -339,7 +339,7 @@ protected function getLimitsInfoRequest($request_id = null)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/api/PaymentsApi.php b/lib/api/PaymentsApi.php
index f16fba9..5c461d2 100644
--- a/lib/api/PaymentsApi.php
+++ b/lib/api/PaymentsApi.php
@@ -323,7 +323,7 @@ protected function createPaymentRequest($payment_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -344,7 +344,7 @@ protected function createPaymentRequest($payment_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -622,7 +622,7 @@ protected function getAuthenticationDataRequest($payment_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -643,7 +643,7 @@ protected function getAuthenticationDataRequest($payment_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -929,7 +929,7 @@ protected function getDisputeRequest($payment_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -950,7 +950,7 @@ protected function getDisputeRequest($payment_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1307,7 +1307,7 @@ protected function getDisputesRequest($request_id, $type, $max_count = null, $of
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1328,7 +1328,7 @@ protected function getDisputesRequest($request_id, $type, $max_count = null, $of
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1606,7 +1606,7 @@ protected function getPaymentRequest($payment_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1627,7 +1627,7 @@ protected function getPaymentRequest($payment_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1917,7 +1917,7 @@ protected function getPaymentMethodsRequest($request_id, $payout_methods_only =
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1938,7 +1938,7 @@ protected function getPaymentMethodsRequest($request_id, $payout_methods_only =
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -2307,7 +2307,7 @@ protected function getPaymentsRequest($request_id, $currency = null, $end_time =
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -2328,7 +2328,7 @@ protected function getPaymentsRequest($request_id, $currency = null, $end_time =
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -2628,7 +2628,7 @@ protected function updatePaymentRequest($payment_id, $payment_patch_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -2649,7 +2649,7 @@ protected function updatePaymentRequest($payment_id, $payment_patch_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/api/PayoutsApi.php b/lib/api/PayoutsApi.php
index a94b361..5fd6e76 100644
--- a/lib/api/PayoutsApi.php
+++ b/lib/api/PayoutsApi.php
@@ -331,7 +331,7 @@ protected function createPayoutRequest($payout_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -352,7 +352,7 @@ protected function createPayoutRequest($payout_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -638,7 +638,7 @@ protected function getPayoutRequest($payout_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -659,7 +659,7 @@ protected function getPayoutRequest($payout_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1028,7 +1028,7 @@ protected function getPayoutsRequest($request_id, $currency = null, $end_time =
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1049,7 +1049,7 @@ protected function getPayoutsRequest($request_id, $currency = null, $end_time =
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1349,7 +1349,7 @@ protected function updatePayoutRequest($payout_id, $payout_update_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1370,7 +1370,7 @@ protected function updatePayoutRequest($payout_id, $payout_update_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/api/RecurringsApi.php b/lib/api/RecurringsApi.php
index b8cd00e..82add9a 100644
--- a/lib/api/RecurringsApi.php
+++ b/lib/api/RecurringsApi.php
@@ -325,7 +325,7 @@ protected function createFilingRequest($filing_request = null)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -346,7 +346,7 @@ protected function createFilingRequest($filing_request = null)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -619,7 +619,7 @@ protected function createPlanRequest($recurring_plan_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -640,7 +640,7 @@ protected function createPlanRequest($recurring_plan_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -921,7 +921,7 @@ protected function createRecurringRequest($recurring_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -942,7 +942,7 @@ protected function createRecurringRequest($recurring_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1191,7 +1191,7 @@ protected function deletePlanRequest($plan_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1212,7 +1212,7 @@ protected function deletePlanRequest($plan_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'DELETE',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1490,7 +1490,7 @@ protected function getAuthenticationData1Request($recurring_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1511,7 +1511,7 @@ protected function getAuthenticationData1Request($recurring_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1808,7 +1808,7 @@ protected function getChangeStatusClaimRequest($claim_id, $subscription_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1829,7 +1829,7 @@ protected function getChangeStatusClaimRequest($claim_id, $subscription_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -2107,7 +2107,7 @@ protected function getFilingRequest($filing_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -2128,7 +2128,7 @@ protected function getFilingRequest($filing_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -2406,7 +2406,7 @@ protected function getPlanRequest($plan_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -2427,7 +2427,7 @@ protected function getPlanRequest($plan_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -2753,7 +2753,7 @@ protected function getPlansRequest($request_id, $max_count = null, $offset = nul
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -2774,7 +2774,7 @@ protected function getPlansRequest($request_id, $max_count = null, $offset = nul
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -3052,7 +3052,7 @@ protected function getRecurringRequest($recurring_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -3073,7 +3073,7 @@ protected function getRecurringRequest($recurring_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -3463,7 +3463,7 @@ protected function getRecurringsRequest($request_id, $currency = null, $end_time
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -3484,7 +3484,7 @@ protected function getRecurringsRequest($request_id, $currency = null, $end_time
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -3762,7 +3762,7 @@ protected function getSubscriptionRequest($subscription_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -3783,7 +3783,7 @@ protected function getSubscriptionRequest($subscription_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -4186,7 +4186,7 @@ protected function getSubscriptionsRequest($request_id, $account_id = null, $cur
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -4207,7 +4207,7 @@ protected function getSubscriptionsRequest($request_id, $account_id = null, $cur
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -4507,7 +4507,7 @@ protected function updatePlanRequest($plan_id, $plan_update_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -4528,7 +4528,7 @@ protected function updatePlanRequest($plan_id, $plan_update_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -4828,7 +4828,7 @@ protected function updateRecurringRequest($recurring_id, $recurring_patch_reques
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -4849,7 +4849,7 @@ protected function updateRecurringRequest($recurring_id, $recurring_patch_reques
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -5149,7 +5149,7 @@ protected function updateSubscriptionRequest($subscription_id, $subscription_upd
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -5170,7 +5170,7 @@ protected function updateSubscriptionRequest($subscription_id, $subscription_upd
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/api/RefundsApi.php b/lib/api/RefundsApi.php
index def78b7..6ac07f7 100644
--- a/lib/api/RefundsApi.php
+++ b/lib/api/RefundsApi.php
@@ -331,7 +331,7 @@ protected function createRefundRequest($refund_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -352,7 +352,7 @@ protected function createRefundRequest($refund_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'POST',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -638,7 +638,7 @@ protected function getRefundRequest($refund_id)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -659,7 +659,7 @@ protected function getRefundRequest($refund_id)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1028,7 +1028,7 @@ protected function getRefundsRequest($request_id, $currency = null, $end_time =
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1049,7 +1049,7 @@ protected function getRefundsRequest($request_id, $currency = null, $end_time =
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'GET',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
@@ -1349,7 +1349,7 @@ protected function updateRefundRequest($refund_id, $refund_update_request)
 
             } else {
                 // for HTTP post (form)
-                $httpBody = \GuzzleHttp\Psr7\build_query($formParams);
+                $httpBody = \GuzzleHttp\Psr7\Query::build($formParams);
             }
         }
 
@@ -1370,7 +1370,7 @@ protected function updateRefundRequest($refund_id, $refund_update_request)
             $headers
         );
 
-        $query = \GuzzleHttp\Psr7\build_query($queryParams);
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
         return new Request(
             'PATCH',
             $this->config->getHost() . $resourcePath . ($query ? "?{$query}" : ''),
diff --git a/lib/model/ApiError.php b/lib/model/ApiError.php
index 2277662..ceb1a80 100644
--- a/lib/model/ApiError.php
+++ b/lib/model/ApiError.php
@@ -263,7 +263,7 @@ public function setRequestId($request_id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -275,7 +275,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -288,7 +288,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -304,7 +304,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ApiTokens.php b/lib/model/ApiTokens.php
index 6ab580b..b139c9d 100644
--- a/lib/model/ApiTokens.php
+++ b/lib/model/ApiTokens.php
@@ -323,7 +323,7 @@ public function setTokenType($token_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/AuthenticationCustomer.php b/lib/model/AuthenticationCustomer.php
index 7c37e2a..644a5f7 100644
--- a/lib/model/AuthenticationCustomer.php
+++ b/lib/model/AuthenticationCustomer.php
@@ -443,7 +443,7 @@ public function setWorkPhone($work_phone)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -455,7 +455,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -468,7 +468,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -484,7 +484,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/AuthenticationData.php b/lib/model/AuthenticationData.php
index 4839748..a87d2dc 100644
--- a/lib/model/AuthenticationData.php
+++ b/lib/model/AuthenticationData.php
@@ -561,7 +561,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -573,7 +573,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -586,7 +586,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -602,7 +602,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/AuthenticationDataResponse.php b/lib/model/AuthenticationDataResponse.php
index a5a5f2c..9f5fead 100644
--- a/lib/model/AuthenticationDataResponse.php
+++ b/lib/model/AuthenticationDataResponse.php
@@ -323,7 +323,7 @@ public function setCustomer($customer)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/AuthenticationError.php b/lib/model/AuthenticationError.php
index e7eeccd..425c3f8 100644
--- a/lib/model/AuthenticationError.php
+++ b/lib/model/AuthenticationError.php
@@ -239,7 +239,7 @@ public function setName($name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -251,7 +251,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -264,7 +264,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -280,7 +280,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/BadRequestError.php b/lib/model/BadRequestError.php
index 8bab72c..1b04e9d 100644
--- a/lib/model/BadRequestError.php
+++ b/lib/model/BadRequestError.php
@@ -269,7 +269,7 @@ public function setRequestId($request_id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -281,7 +281,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -294,7 +294,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -310,7 +310,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/BankCardPayoutData.php b/lib/model/BankCardPayoutData.php
index 574fb61..a5dabfa 100644
--- a/lib/model/BankCardPayoutData.php
+++ b/lib/model/BankCardPayoutData.php
@@ -553,7 +553,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -565,7 +565,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -578,7 +578,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -594,7 +594,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/BillingAddress.php b/lib/model/BillingAddress.php
index 6caded5..dc5abc5 100644
--- a/lib/model/BillingAddress.php
+++ b/lib/model/BillingAddress.php
@@ -410,7 +410,7 @@ public function setZip($zip)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -422,7 +422,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -435,7 +435,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -451,7 +451,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/CardInfoRequest.php b/lib/model/CardInfoRequest.php
index 36e20d4..346240f 100644
--- a/lib/model/CardInfoRequest.php
+++ b/lib/model/CardInfoRequest.php
@@ -228,7 +228,7 @@ public function setBin($bin)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -240,7 +240,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -253,7 +253,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -269,7 +269,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/CardInfoResponse.php b/lib/model/CardInfoResponse.php
index 424ca4b..404ecd8 100644
--- a/lib/model/CardInfoResponse.php
+++ b/lib/model/CardInfoResponse.php
@@ -323,7 +323,7 @@ public function setCountry($country)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ChangeSubscriptionStatusClaimResponse.php b/lib/model/ChangeSubscriptionStatusClaimResponse.php
index 47827fd..8878a98 100644
--- a/lib/model/ChangeSubscriptionStatusClaimResponse.php
+++ b/lib/model/ChangeSubscriptionStatusClaimResponse.php
@@ -387,7 +387,7 @@ public function setUpdated($updated)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -399,7 +399,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -412,7 +412,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -428,7 +428,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ChangedPlanData.php b/lib/model/ChangedPlanData.php
index 710ca7f..29988fb 100644
--- a/lib/model/ChangedPlanData.php
+++ b/lib/model/ChangedPlanData.php
@@ -477,7 +477,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -489,7 +489,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -502,7 +502,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -518,7 +518,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ClaimResponseSubscriptionData.php b/lib/model/ClaimResponseSubscriptionData.php
index 6528e89..a519a20 100644
--- a/lib/model/ClaimResponseSubscriptionData.php
+++ b/lib/model/ClaimResponseSubscriptionData.php
@@ -277,7 +277,7 @@ public function setStatusTo($status_to)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -289,7 +289,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -302,7 +302,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -318,7 +318,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Confirm3dsRequest.php b/lib/model/Confirm3dsRequest.php
index 41ba8d8..6af27a7 100644
--- a/lib/model/Confirm3dsRequest.php
+++ b/lib/model/Confirm3dsRequest.php
@@ -239,7 +239,7 @@ public function setPaRes($pa_res)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -251,7 +251,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -264,7 +264,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -280,7 +280,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeList.php b/lib/model/DisputeList.php
index aaf4a2c..62a8db2 100644
--- a/lib/model/DisputeList.php
+++ b/lib/model/DisputeList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponse.php b/lib/model/DisputeResponse.php
index b7b7856..f1fc554 100644
--- a/lib/model/DisputeResponse.php
+++ b/lib/model/DisputeResponse.php
@@ -323,7 +323,7 @@ public function setPaymentData($payment_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponseCard.php b/lib/model/DisputeResponseCard.php
index ed27b73..ac6a247 100644
--- a/lib/model/DisputeResponseCard.php
+++ b/lib/model/DisputeResponseCard.php
@@ -233,7 +233,7 @@ public function setMaskedPan($masked_pan)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponseCardAccount.php b/lib/model/DisputeResponseCardAccount.php
index 7affdc9..9bd44ca 100644
--- a/lib/model/DisputeResponseCardAccount.php
+++ b/lib/model/DisputeResponseCardAccount.php
@@ -203,7 +203,7 @@ public function setCard($card)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponseCustomer.php b/lib/model/DisputeResponseCustomer.php
index 21ba1c4..565f931 100644
--- a/lib/model/DisputeResponseCustomer.php
+++ b/lib/model/DisputeResponseCustomer.php
@@ -203,7 +203,7 @@ public function setEmail($email)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponseDisputeData.php b/lib/model/DisputeResponseDisputeData.php
index f310f87..c1898f1 100644
--- a/lib/model/DisputeResponseDisputeData.php
+++ b/lib/model/DisputeResponseDisputeData.php
@@ -443,7 +443,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -455,7 +455,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -468,7 +468,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -484,7 +484,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponseMerchantOrder.php b/lib/model/DisputeResponseMerchantOrder.php
index ff107f1..aa0b759 100644
--- a/lib/model/DisputeResponseMerchantOrder.php
+++ b/lib/model/DisputeResponseMerchantOrder.php
@@ -233,7 +233,7 @@ public function setWebsiteUrl($website_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/DisputeResponsePaymentData.php b/lib/model/DisputeResponsePaymentData.php
index dd4995c..e022352 100644
--- a/lib/model/DisputeResponsePaymentData.php
+++ b/lib/model/DisputeResponsePaymentData.php
@@ -353,7 +353,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -365,7 +365,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -378,7 +378,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -394,7 +394,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/EwalletAccount.php b/lib/model/EwalletAccount.php
index 61a287e..3fa0296 100644
--- a/lib/model/EwalletAccount.php
+++ b/lib/model/EwalletAccount.php
@@ -353,7 +353,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -365,7 +365,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -378,7 +378,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -394,7 +394,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/FilingRecurringData.php b/lib/model/FilingRecurringData.php
index c6c65e3..eea0113 100644
--- a/lib/model/FilingRecurringData.php
+++ b/lib/model/FilingRecurringData.php
@@ -452,7 +452,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -464,7 +464,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -477,7 +477,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -493,7 +493,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/FilingRequest.php b/lib/model/FilingRequest.php
index bc946c6..7dfab33 100644
--- a/lib/model/FilingRequest.php
+++ b/lib/model/FilingRequest.php
@@ -464,7 +464,7 @@ public function setThreeDSecure($three_d_secure)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -476,7 +476,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -489,7 +489,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -505,7 +505,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/FilingRequestMerchantOrder.php b/lib/model/FilingRequestMerchantOrder.php
index 1d8fae3..07bfc65 100644
--- a/lib/model/FilingRequestMerchantOrder.php
+++ b/lib/model/FilingRequestMerchantOrder.php
@@ -299,7 +299,7 @@ public function setShippingAddress($shipping_address)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -311,7 +311,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -324,7 +324,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -340,7 +340,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/FilingRequestSubscriptionData.php b/lib/model/FilingRequestSubscriptionData.php
index f6d95b1..e03e1e0 100644
--- a/lib/model/FilingRequestSubscriptionData.php
+++ b/lib/model/FilingRequestSubscriptionData.php
@@ -218,7 +218,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -230,7 +230,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -243,7 +243,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -259,7 +259,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/FilterParameters.php b/lib/model/FilterParameters.php
index da3e920..9ebe3eb 100644
--- a/lib/model/FilterParameters.php
+++ b/lib/model/FilterParameters.php
@@ -518,7 +518,7 @@ public function setCurrency($currency)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -530,7 +530,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -543,7 +543,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -559,7 +559,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Flight.php b/lib/model/Flight.php
index 8e2c121..fe1f21e 100644
--- a/lib/model/Flight.php
+++ b/lib/model/Flight.php
@@ -458,7 +458,7 @@ public function setStopOverCode($stop_over_code)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -470,7 +470,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -483,7 +483,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -499,7 +499,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Flights.php b/lib/model/Flights.php
index c99d8c8..a2742c4 100644
--- a/lib/model/Flights.php
+++ b/lib/model/Flights.php
@@ -623,7 +623,7 @@ public function setTravelAgencyName($travel_agency_name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -635,7 +635,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -648,7 +648,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -664,7 +664,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InstallmentData.php b/lib/model/InstallmentData.php
index 0669027..38ddb52 100644
--- a/lib/model/InstallmentData.php
+++ b/lib/model/InstallmentData.php
@@ -634,7 +634,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -646,7 +646,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -659,7 +659,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -675,7 +675,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceCreationDataResponse.php b/lib/model/InvoiceCreationDataResponse.php
index b2c2fdf..60f2748 100644
--- a/lib/model/InvoiceCreationDataResponse.php
+++ b/lib/model/InvoiceCreationDataResponse.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceCreationResponse.php b/lib/model/InvoiceCreationResponse.php
index 8a016d6..c8b6ba3 100644
--- a/lib/model/InvoiceCreationResponse.php
+++ b/lib/model/InvoiceCreationResponse.php
@@ -233,7 +233,7 @@ public function setInvoiceUrl($invoice_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceCustomer.php b/lib/model/InvoiceCustomer.php
index 7cf2d4b..3abc43c 100644
--- a/lib/model/InvoiceCustomer.php
+++ b/lib/model/InvoiceCustomer.php
@@ -233,7 +233,7 @@ public function setPhone($phone)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceData.php b/lib/model/InvoiceData.php
index 62890ea..497c70a 100644
--- a/lib/model/InvoiceData.php
+++ b/lib/model/InvoiceData.php
@@ -329,7 +329,7 @@ public function setInstallments($installments)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -341,7 +341,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -354,7 +354,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -370,7 +370,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceGetDataResponse.php b/lib/model/InvoiceGetDataResponse.php
index eb7d05a..b9bc6be 100644
--- a/lib/model/InvoiceGetDataResponse.php
+++ b/lib/model/InvoiceGetDataResponse.php
@@ -332,7 +332,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -344,7 +344,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -357,7 +357,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -373,7 +373,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceGetResponse.php b/lib/model/InvoiceGetResponse.php
index b7aa4ce..3b5348d 100644
--- a/lib/model/InvoiceGetResponse.php
+++ b/lib/model/InvoiceGetResponse.php
@@ -302,7 +302,7 @@ public function setMerchantOrder($merchant_order)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -314,7 +314,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -327,7 +327,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -343,7 +343,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceItem.php b/lib/model/InvoiceItem.php
index f68d0a9..9fddbc0 100644
--- a/lib/model/InvoiceItem.php
+++ b/lib/model/InvoiceItem.php
@@ -296,7 +296,7 @@ public function setPrice($price)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -308,7 +308,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -321,7 +321,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -337,7 +337,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceMerchantOrder.php b/lib/model/InvoiceMerchantOrder.php
index 07db33b..67a1f75 100644
--- a/lib/model/InvoiceMerchantOrder.php
+++ b/lib/model/InvoiceMerchantOrder.php
@@ -254,7 +254,7 @@ public function setItems($items)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -266,7 +266,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -279,7 +279,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -295,7 +295,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/InvoiceRequest.php b/lib/model/InvoiceRequest.php
index 05fa30e..3d1481e 100644
--- a/lib/model/InvoiceRequest.php
+++ b/lib/model/InvoiceRequest.php
@@ -332,7 +332,7 @@ public function setReturnUrls($return_urls)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -344,7 +344,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -357,7 +357,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -373,7 +373,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Item.php b/lib/model/Item.php
index 29bf481..c58d244 100644
--- a/lib/model/Item.php
+++ b/lib/model/Item.php
@@ -335,7 +335,7 @@ public function setPrice($price)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -347,7 +347,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -360,7 +360,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -376,7 +376,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/LimitInfoResponse.php b/lib/model/LimitInfoResponse.php
index e78e47b..88bde68 100644
--- a/lib/model/LimitInfoResponse.php
+++ b/lib/model/LimitInfoResponse.php
@@ -203,7 +203,7 @@ public function setRemainingLimits($remaining_limits)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/NextSubscriptionPayment.php b/lib/model/NextSubscriptionPayment.php
index 8a78ac2..520bc11 100644
--- a/lib/model/NextSubscriptionPayment.php
+++ b/lib/model/NextSubscriptionPayment.php
@@ -203,7 +203,7 @@ public function setDate($date)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/NotFoundError.php b/lib/model/NotFoundError.php
index 8eb54aa..c03c7cb 100644
--- a/lib/model/NotFoundError.php
+++ b/lib/model/NotFoundError.php
@@ -269,7 +269,7 @@ public function setRequestId($request_id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -281,7 +281,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -294,7 +294,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -310,7 +310,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/OAuthError.php b/lib/model/OAuthError.php
index f207498..0242a9b 100644
--- a/lib/model/OAuthError.php
+++ b/lib/model/OAuthError.php
@@ -267,7 +267,7 @@ public function setMessage($message)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -279,7 +279,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -292,7 +292,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -308,7 +308,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/OneclickData.php b/lib/model/OneclickData.php
index 2f6309e..912fff9 100644
--- a/lib/model/OneclickData.php
+++ b/lib/model/OneclickData.php
@@ -664,7 +664,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -676,7 +676,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -689,7 +689,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -705,7 +705,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentCallback.php b/lib/model/PaymentCallback.php
index f8ecdd2..920b372 100644
--- a/lib/model/PaymentCallback.php
+++ b/lib/model/PaymentCallback.php
@@ -413,7 +413,7 @@ public function setPaymentMethod($payment_method)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -425,7 +425,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -438,7 +438,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -454,7 +454,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentConfirm3dsRequest.php b/lib/model/PaymentConfirm3dsRequest.php
index 5ad1447..f7ce00c 100644
--- a/lib/model/PaymentConfirm3dsRequest.php
+++ b/lib/model/PaymentConfirm3dsRequest.php
@@ -336,7 +336,7 @@ public function setPaRes($pa_res)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -348,7 +348,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -361,7 +361,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -377,7 +377,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentExecuteRequest.php b/lib/model/PaymentExecuteRequest.php
index 0505aac..a2183a5 100644
--- a/lib/model/PaymentExecuteRequest.php
+++ b/lib/model/PaymentExecuteRequest.php
@@ -303,7 +303,7 @@ public function setPaymentData($payment_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -315,7 +315,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -328,7 +328,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -344,7 +344,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentGatewayCreationResponse.php b/lib/model/PaymentGatewayCreationResponse.php
index d7ac4cc..5ba322f 100644
--- a/lib/model/PaymentGatewayCreationResponse.php
+++ b/lib/model/PaymentGatewayCreationResponse.php
@@ -233,7 +233,7 @@ public function setRedirectUrl($redirect_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentGatewayResponsePaymentData.php b/lib/model/PaymentGatewayResponsePaymentData.php
index dcfefbb..c7161d6 100644
--- a/lib/model/PaymentGatewayResponsePaymentData.php
+++ b/lib/model/PaymentGatewayResponsePaymentData.php
@@ -263,7 +263,7 @@ public function setSeparateAuth($separate_auth)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -275,7 +275,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -288,7 +288,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -304,7 +304,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentMethodsResponse.php b/lib/model/PaymentMethodsResponse.php
index 68c9074..85d7390 100644
--- a/lib/model/PaymentMethodsResponse.php
+++ b/lib/model/PaymentMethodsResponse.php
@@ -293,7 +293,7 @@ public function setSupportedPaymentMethods($supported_payment_methods)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -305,7 +305,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -318,7 +318,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -334,7 +334,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentPatchRequest.php b/lib/model/PaymentPatchRequest.php
index ed98f39..cbdcb62 100644
--- a/lib/model/PaymentPatchRequest.php
+++ b/lib/model/PaymentPatchRequest.php
@@ -299,7 +299,7 @@ public function setPaymentData($payment_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -311,7 +311,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -324,7 +324,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -340,7 +340,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequest.php b/lib/model/PaymentRequest.php
index 2299a32..3fde7be 100644
--- a/lib/model/PaymentRequest.php
+++ b/lib/model/PaymentRequest.php
@@ -503,7 +503,7 @@ public function setReturnUrls($return_urls)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -515,7 +515,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -528,7 +528,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -544,7 +544,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestCard.php b/lib/model/PaymentRequestCard.php
index ab66487..08cea6e 100644
--- a/lib/model/PaymentRequestCard.php
+++ b/lib/model/PaymentRequestCard.php
@@ -444,7 +444,7 @@ public function setSecurityCode($security_code)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -456,7 +456,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -469,7 +469,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -485,7 +485,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestCardAccount.php b/lib/model/PaymentRequestCardAccount.php
index c688f65..2b9eee1 100644
--- a/lib/model/PaymentRequestCardAccount.php
+++ b/lib/model/PaymentRequestCardAccount.php
@@ -368,7 +368,7 @@ public function setToken($token)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -380,7 +380,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -393,7 +393,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -409,7 +409,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestCryptocurrencyAccount.php b/lib/model/PaymentRequestCryptocurrencyAccount.php
index d01a5f6..4b52c65 100644
--- a/lib/model/PaymentRequestCryptocurrencyAccount.php
+++ b/lib/model/PaymentRequestCryptocurrencyAccount.php
@@ -218,7 +218,7 @@ public function setRollbackAddress($rollback_address)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -230,7 +230,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -243,7 +243,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -259,7 +259,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestCustomer.php b/lib/model/PaymentRequestCustomer.php
index 788c414..0ff6f91 100644
--- a/lib/model/PaymentRequestCustomer.php
+++ b/lib/model/PaymentRequestCustomer.php
@@ -728,7 +728,7 @@ public function setWorkPhone($work_phone)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -740,7 +740,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -753,7 +753,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -769,7 +769,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestEWalletAccount.php b/lib/model/PaymentRequestEWalletAccount.php
index 585854b..8294730 100644
--- a/lib/model/PaymentRequestEWalletAccount.php
+++ b/lib/model/PaymentRequestEWalletAccount.php
@@ -341,7 +341,7 @@ public function setVerificationCode($verification_code)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -353,7 +353,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -366,7 +366,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -382,7 +382,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestLivingAddress.php b/lib/model/PaymentRequestLivingAddress.php
index 0300420..9181595 100644
--- a/lib/model/PaymentRequestLivingAddress.php
+++ b/lib/model/PaymentRequestLivingAddress.php
@@ -398,7 +398,7 @@ public function setZip($zip)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -410,7 +410,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -423,7 +423,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -439,7 +439,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestMerchantOrder.php b/lib/model/PaymentRequestMerchantOrder.php
index 6e7d8fb..eecbdae 100644
--- a/lib/model/PaymentRequestMerchantOrder.php
+++ b/lib/model/PaymentRequestMerchantOrder.php
@@ -389,7 +389,7 @@ public function setShippingAddress($shipping_address)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -401,7 +401,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -414,7 +414,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -430,7 +430,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentRequestPaymentData.php b/lib/model/PaymentRequestPaymentData.php
index c6a7e7f..67c6c34 100644
--- a/lib/model/PaymentRequestPaymentData.php
+++ b/lib/model/PaymentRequestPaymentData.php
@@ -709,7 +709,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -721,7 +721,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -734,7 +734,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -750,7 +750,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentResponse.php b/lib/model/PaymentResponse.php
index d8a56fd..a463066 100644
--- a/lib/model/PaymentResponse.php
+++ b/lib/model/PaymentResponse.php
@@ -323,7 +323,7 @@ public function setCardAccount($card_account)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentResponseCardAccount.php b/lib/model/PaymentResponseCardAccount.php
index b82f944..b95abd3 100644
--- a/lib/model/PaymentResponseCardAccount.php
+++ b/lib/model/PaymentResponseCardAccount.php
@@ -515,7 +515,7 @@ public function setToken($token)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -527,7 +527,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -540,7 +540,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -556,7 +556,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentResponseCryptocurrencyAccount.php b/lib/model/PaymentResponseCryptocurrencyAccount.php
index 7ca0ef8..7c976cb 100644
--- a/lib/model/PaymentResponseCryptocurrencyAccount.php
+++ b/lib/model/PaymentResponseCryptocurrencyAccount.php
@@ -293,7 +293,7 @@ public function setPrcCurrency($prc_currency)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -305,7 +305,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -318,7 +318,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -334,7 +334,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentResponseCustomer.php b/lib/model/PaymentResponseCustomer.php
index 1a8e8eb..6d32100 100644
--- a/lib/model/PaymentResponseCustomer.php
+++ b/lib/model/PaymentResponseCustomer.php
@@ -473,7 +473,7 @@ public function setWorkPhone($work_phone)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -485,7 +485,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -498,7 +498,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -514,7 +514,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentResponsePaymentData.php b/lib/model/PaymentResponsePaymentData.php
index 02284b8..42312d1 100644
--- a/lib/model/PaymentResponsePaymentData.php
+++ b/lib/model/PaymentResponsePaymentData.php
@@ -801,7 +801,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -813,7 +813,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -826,7 +826,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -842,7 +842,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentUpdateRequest.php b/lib/model/PaymentUpdateRequest.php
index 7da8e65..7a31d59 100644
--- a/lib/model/PaymentUpdateRequest.php
+++ b/lib/model/PaymentUpdateRequest.php
@@ -303,7 +303,7 @@ public function setPaymentData($payment_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -315,7 +315,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -328,7 +328,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -344,7 +344,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentUpdateResponse.php b/lib/model/PaymentUpdateResponse.php
index 543fe14..d6d79ee 100644
--- a/lib/model/PaymentUpdateResponse.php
+++ b/lib/model/PaymentUpdateResponse.php
@@ -297,7 +297,7 @@ public function setPaymentData($payment_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -309,7 +309,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -322,7 +322,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -338,7 +338,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentUpdateTransactionData.php b/lib/model/PaymentUpdateTransactionData.php
index db43863..652cf0e 100644
--- a/lib/model/PaymentUpdateTransactionData.php
+++ b/lib/model/PaymentUpdateTransactionData.php
@@ -267,7 +267,7 @@ public function setStatusTo($status_to)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -279,7 +279,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -292,7 +292,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -308,7 +308,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PaymentsList.php b/lib/model/PaymentsList.php
index 73376aa..2701512 100644
--- a/lib/model/PaymentsList.php
+++ b/lib/model/PaymentsList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutCallback.php b/lib/model/PayoutCallback.php
index d45ff88..ba3b05f 100644
--- a/lib/model/PayoutCallback.php
+++ b/lib/model/PayoutCallback.php
@@ -443,7 +443,7 @@ public function setPayoutData($payout_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -455,7 +455,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -468,7 +468,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -484,7 +484,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutCreationResponse.php b/lib/model/PayoutCreationResponse.php
index b105f20..394bdf8 100644
--- a/lib/model/PayoutCreationResponse.php
+++ b/lib/model/PayoutCreationResponse.php
@@ -178,7 +178,7 @@ public function valid()
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -190,7 +190,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -203,7 +203,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -219,7 +219,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutPaymentData.php b/lib/model/PayoutPaymentData.php
index 27e7060..2958b15 100644
--- a/lib/model/PayoutPaymentData.php
+++ b/lib/model/PayoutPaymentData.php
@@ -221,7 +221,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -233,7 +233,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -246,7 +246,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -262,7 +262,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequest.php b/lib/model/PayoutRequest.php
index 017c90e..f994836 100644
--- a/lib/model/PayoutRequest.php
+++ b/lib/model/PayoutRequest.php
@@ -470,7 +470,7 @@ public function setPayoutData($payout_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -482,7 +482,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -495,7 +495,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -511,7 +511,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestCard.php b/lib/model/PayoutRequestCard.php
index 531c7d4..4ac4d50 100644
--- a/lib/model/PayoutRequestCard.php
+++ b/lib/model/PayoutRequestCard.php
@@ -260,7 +260,7 @@ public function setPan($pan)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -272,7 +272,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -285,7 +285,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -301,7 +301,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestCardAccount.php b/lib/model/PayoutRequestCardAccount.php
index 81ad6ad..5996714 100644
--- a/lib/model/PayoutRequestCardAccount.php
+++ b/lib/model/PayoutRequestCardAccount.php
@@ -329,7 +329,7 @@ public function setToken($token)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -341,7 +341,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -354,7 +354,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -370,7 +370,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestCryptocurrencyAccount.php b/lib/model/PayoutRequestCryptocurrencyAccount.php
index 1b3abe4..d078e3a 100644
--- a/lib/model/PayoutRequestCryptocurrencyAccount.php
+++ b/lib/model/PayoutRequestCryptocurrencyAccount.php
@@ -218,7 +218,7 @@ public function setCryptoAddress($crypto_address)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -230,7 +230,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -243,7 +243,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -259,7 +259,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestCustomer.php b/lib/model/PayoutRequestCustomer.php
index 283334c..fc56e0c 100644
--- a/lib/model/PayoutRequestCustomer.php
+++ b/lib/model/PayoutRequestCustomer.php
@@ -617,7 +617,7 @@ public function setTaxReasonCode($tax_reason_code)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -629,7 +629,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -642,7 +642,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -658,7 +658,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestEWalletAccount.php b/lib/model/PayoutRequestEWalletAccount.php
index f20f9bb..1eb60a5 100644
--- a/lib/model/PayoutRequestEWalletAccount.php
+++ b/lib/model/PayoutRequestEWalletAccount.php
@@ -368,7 +368,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -380,7 +380,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -393,7 +393,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -409,7 +409,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestLivingAddress.php b/lib/model/PayoutRequestLivingAddress.php
index c3a88a4..fa804d2 100644
--- a/lib/model/PayoutRequestLivingAddress.php
+++ b/lib/model/PayoutRequestLivingAddress.php
@@ -398,7 +398,7 @@ public function setZip($zip)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -410,7 +410,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -423,7 +423,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -439,7 +439,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestMerchantOrder.php b/lib/model/PayoutRequestMerchantOrder.php
index ed5aea1..abb80b8 100644
--- a/lib/model/PayoutRequestMerchantOrder.php
+++ b/lib/model/PayoutRequestMerchantOrder.php
@@ -281,7 +281,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -293,7 +293,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -306,7 +306,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -322,7 +322,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutRequestPayoutData.php b/lib/model/PayoutRequestPayoutData.php
index 9f288cf..f398f1e 100644
--- a/lib/model/PayoutRequestPayoutData.php
+++ b/lib/model/PayoutRequestPayoutData.php
@@ -359,7 +359,7 @@ public function setNote($note)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -371,7 +371,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -384,7 +384,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -400,7 +400,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponse.php b/lib/model/PayoutResponse.php
index e4873d1..c0a271f 100644
--- a/lib/model/PayoutResponse.php
+++ b/lib/model/PayoutResponse.php
@@ -416,7 +416,7 @@ public function setMerchantOrder($merchant_order)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -428,7 +428,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -441,7 +441,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -457,7 +457,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponseCardAccount.php b/lib/model/PayoutResponseCardAccount.php
index bbc036e..639138d 100644
--- a/lib/model/PayoutResponseCardAccount.php
+++ b/lib/model/PayoutResponseCardAccount.php
@@ -451,7 +451,7 @@ public function setToken($token)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -463,7 +463,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -476,7 +476,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -492,7 +492,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponseCryptocurrencyAccount.php b/lib/model/PayoutResponseCryptocurrencyAccount.php
index f245d2c..200d8bf 100644
--- a/lib/model/PayoutResponseCryptocurrencyAccount.php
+++ b/lib/model/PayoutResponseCryptocurrencyAccount.php
@@ -293,7 +293,7 @@ public function setPrcCurrency($prc_currency)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -305,7 +305,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -318,7 +318,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -334,7 +334,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponseCustomer.php b/lib/model/PayoutResponseCustomer.php
index a4b2bd1..93b059a 100644
--- a/lib/model/PayoutResponseCustomer.php
+++ b/lib/model/PayoutResponseCustomer.php
@@ -323,7 +323,7 @@ public function setUserAgent($user_agent)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponseEWalletAccount.php b/lib/model/PayoutResponseEWalletAccount.php
index e0d3381..dbc6a28 100644
--- a/lib/model/PayoutResponseEWalletAccount.php
+++ b/lib/model/PayoutResponseEWalletAccount.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutResponsePayoutData.php b/lib/model/PayoutResponsePayoutData.php
index 00e38ca..b85d37a 100644
--- a/lib/model/PayoutResponsePayoutData.php
+++ b/lib/model/PayoutResponsePayoutData.php
@@ -553,7 +553,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -565,7 +565,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -578,7 +578,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -594,7 +594,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutUpdateRequest.php b/lib/model/PayoutUpdateRequest.php
index ffeb7e8..86d5c3d 100644
--- a/lib/model/PayoutUpdateRequest.php
+++ b/lib/model/PayoutUpdateRequest.php
@@ -236,7 +236,7 @@ public function setPayoutData($payout_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -248,7 +248,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -261,7 +261,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -277,7 +277,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutUpdateResponse.php b/lib/model/PayoutUpdateResponse.php
index 65ee689..86b652e 100644
--- a/lib/model/PayoutUpdateResponse.php
+++ b/lib/model/PayoutUpdateResponse.php
@@ -233,7 +233,7 @@ public function setPayoutData($payout_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PayoutsList.php b/lib/model/PayoutsList.php
index ed34bfc..2815dbe 100644
--- a/lib/model/PayoutsList.php
+++ b/lib/model/PayoutsList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PixAccountDetailsRequest.php b/lib/model/PixAccountDetailsRequest.php
index 4552db3..d1c5c0c 100644
--- a/lib/model/PixAccountDetailsRequest.php
+++ b/lib/model/PixAccountDetailsRequest.php
@@ -206,7 +206,7 @@ public function setCustomerIdentity($customer_identity)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -218,7 +218,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -231,7 +231,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -247,7 +247,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PixAccountDetailsResponse.php b/lib/model/PixAccountDetailsResponse.php
index 6d4351d..3b274f9 100644
--- a/lib/model/PixAccountDetailsResponse.php
+++ b/lib/model/PixAccountDetailsResponse.php
@@ -203,7 +203,7 @@ public function setEwalletAccount($ewallet_account)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Plan.php b/lib/model/Plan.php
index beb860d..615175a 100644
--- a/lib/model/Plan.php
+++ b/lib/model/Plan.php
@@ -218,7 +218,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -230,7 +230,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -243,7 +243,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -259,7 +259,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PlanDataList.php b/lib/model/PlanDataList.php
index b3fac9a..84f1724 100644
--- a/lib/model/PlanDataList.php
+++ b/lib/model/PlanDataList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PlanUpdateRequest.php b/lib/model/PlanUpdateRequest.php
index 40a2d22..f80f16f 100644
--- a/lib/model/PlanUpdateRequest.php
+++ b/lib/model/PlanUpdateRequest.php
@@ -304,7 +304,7 @@ public function setPlanData($plan_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -316,7 +316,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -329,7 +329,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -345,7 +345,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PlanUpdateRequestPlanData.php b/lib/model/PlanUpdateRequestPlanData.php
index de6dc82..950fda2 100644
--- a/lib/model/PlanUpdateRequestPlanData.php
+++ b/lib/model/PlanUpdateRequestPlanData.php
@@ -280,7 +280,7 @@ public function setStatusTo($status_to)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -292,7 +292,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -305,7 +305,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -321,7 +321,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/PlanUpdateResponse.php b/lib/model/PlanUpdateResponse.php
index a75325d..a33e185 100644
--- a/lib/model/PlanUpdateResponse.php
+++ b/lib/model/PlanUpdateResponse.php
@@ -203,7 +203,7 @@ public function setPlanData($plan_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringCallback.php b/lib/model/RecurringCallback.php
index 615cbc4..19dddbd 100644
--- a/lib/model/RecurringCallback.php
+++ b/lib/model/RecurringCallback.php
@@ -353,7 +353,7 @@ public function setRecurringData($recurring_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -365,7 +365,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -378,7 +378,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -394,7 +394,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringConfirm3dsRequest.php b/lib/model/RecurringConfirm3dsRequest.php
index c41cae0..d2ae535 100644
--- a/lib/model/RecurringConfirm3dsRequest.php
+++ b/lib/model/RecurringConfirm3dsRequest.php
@@ -336,7 +336,7 @@ public function setPaRes($pa_res)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -348,7 +348,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -361,7 +361,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -377,7 +377,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringCreationRequest.php b/lib/model/RecurringCreationRequest.php
index 1cf3fe8..b187d72 100644
--- a/lib/model/RecurringCreationRequest.php
+++ b/lib/model/RecurringCreationRequest.php
@@ -401,7 +401,7 @@ public function setReturnUrls($return_urls)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -413,7 +413,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -426,7 +426,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -442,7 +442,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringCustomer.php b/lib/model/RecurringCustomer.php
index 9b4e39e..aceebb8 100644
--- a/lib/model/RecurringCustomer.php
+++ b/lib/model/RecurringCustomer.php
@@ -605,7 +605,7 @@ public function setWorkPhone($work_phone)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -617,7 +617,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -630,7 +630,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -646,7 +646,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringExecuteRequest.php b/lib/model/RecurringExecuteRequest.php
index ee3a808..32e7b17 100644
--- a/lib/model/RecurringExecuteRequest.php
+++ b/lib/model/RecurringExecuteRequest.php
@@ -303,7 +303,7 @@ public function setRecurringData($recurring_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -315,7 +315,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -328,7 +328,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -344,7 +344,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringFilterParameters.php b/lib/model/RecurringFilterParameters.php
index 7919069..fc98012 100644
--- a/lib/model/RecurringFilterParameters.php
+++ b/lib/model/RecurringFilterParameters.php
@@ -582,7 +582,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -594,7 +594,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -607,7 +607,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -623,7 +623,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringGatewayCreationResponse.php b/lib/model/RecurringGatewayCreationResponse.php
index b5a1358..1918063 100644
--- a/lib/model/RecurringGatewayCreationResponse.php
+++ b/lib/model/RecurringGatewayCreationResponse.php
@@ -263,7 +263,7 @@ public function setRedirectUrl($redirect_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -275,7 +275,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -288,7 +288,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -304,7 +304,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringGatewayResponseRecurringData.php b/lib/model/RecurringGatewayResponseRecurringData.php
index b130309..151063c 100644
--- a/lib/model/RecurringGatewayResponseRecurringData.php
+++ b/lib/model/RecurringGatewayResponseRecurringData.php
@@ -233,7 +233,7 @@ public function setSeparateAuth($separate_auth)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringPatchRequest.php b/lib/model/RecurringPatchRequest.php
index c0f613b..b302a6f 100644
--- a/lib/model/RecurringPatchRequest.php
+++ b/lib/model/RecurringPatchRequest.php
@@ -299,7 +299,7 @@ public function setRecurringData($recurring_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -311,7 +311,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -324,7 +324,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -340,7 +340,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringPlanRequest.php b/lib/model/RecurringPlanRequest.php
index 05738cd..fa35a6f 100644
--- a/lib/model/RecurringPlanRequest.php
+++ b/lib/model/RecurringPlanRequest.php
@@ -239,7 +239,7 @@ public function setPlanData($plan_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -251,7 +251,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -264,7 +264,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -280,7 +280,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringPlanRequestPlanData.php b/lib/model/RecurringPlanRequestPlanData.php
index 54c125b..929e6c0 100644
--- a/lib/model/RecurringPlanRequestPlanData.php
+++ b/lib/model/RecurringPlanRequestPlanData.php
@@ -460,7 +460,7 @@ public function setRetries($retries)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -472,7 +472,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -485,7 +485,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -501,7 +501,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringPlanResponse.php b/lib/model/RecurringPlanResponse.php
index 0c10125..dafeffb 100644
--- a/lib/model/RecurringPlanResponse.php
+++ b/lib/model/RecurringPlanResponse.php
@@ -203,7 +203,7 @@ public function setPlanData($plan_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringRequestFiling.php b/lib/model/RecurringRequestFiling.php
index 8913308..1943d2f 100644
--- a/lib/model/RecurringRequestFiling.php
+++ b/lib/model/RecurringRequestFiling.php
@@ -218,7 +218,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -230,7 +230,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -243,7 +243,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -259,7 +259,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringRequestRecurringData.php b/lib/model/RecurringRequestRecurringData.php
index 4c20e4c..a3eff41 100644
--- a/lib/model/RecurringRequestRecurringData.php
+++ b/lib/model/RecurringRequestRecurringData.php
@@ -711,7 +711,7 @@ public function setSubscriptionStart($subscription_start)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -723,7 +723,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -736,7 +736,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -752,7 +752,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringResponse.php b/lib/model/RecurringResponse.php
index 6b5f6dd..39e7309 100644
--- a/lib/model/RecurringResponse.php
+++ b/lib/model/RecurringResponse.php
@@ -353,7 +353,7 @@ public function setAuthenticationData($authentication_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -365,7 +365,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -378,7 +378,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -394,7 +394,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringResponseFiling.php b/lib/model/RecurringResponseFiling.php
index 9d54593..5a6a633 100644
--- a/lib/model/RecurringResponseFiling.php
+++ b/lib/model/RecurringResponseFiling.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringResponseMerchantOrder.php b/lib/model/RecurringResponseMerchantOrder.php
index 6ba2a2a..cccdd44 100644
--- a/lib/model/RecurringResponseMerchantOrder.php
+++ b/lib/model/RecurringResponseMerchantOrder.php
@@ -251,7 +251,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -263,7 +263,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -276,7 +276,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -292,7 +292,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringResponseRecurringData.php b/lib/model/RecurringResponseRecurringData.php
index 4f6bdaf..e09a059 100644
--- a/lib/model/RecurringResponseRecurringData.php
+++ b/lib/model/RecurringResponseRecurringData.php
@@ -1047,7 +1047,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -1059,7 +1059,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -1072,7 +1072,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -1088,7 +1088,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringUpdateRequest.php b/lib/model/RecurringUpdateRequest.php
index b131ee4..ae34f0c 100644
--- a/lib/model/RecurringUpdateRequest.php
+++ b/lib/model/RecurringUpdateRequest.php
@@ -303,7 +303,7 @@ public function setRecurringData($recurring_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -315,7 +315,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -328,7 +328,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -344,7 +344,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringUpdateResponse.php b/lib/model/RecurringUpdateResponse.php
index 294094b..738e3f7 100644
--- a/lib/model/RecurringUpdateResponse.php
+++ b/lib/model/RecurringUpdateResponse.php
@@ -297,7 +297,7 @@ public function setRecurringData($recurring_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -309,7 +309,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -322,7 +322,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -338,7 +338,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RecurringsList.php b/lib/model/RecurringsList.php
index dcf6d3b..b6b100b 100644
--- a/lib/model/RecurringsList.php
+++ b/lib/model/RecurringsList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RedirectUrlResponse.php b/lib/model/RedirectUrlResponse.php
index 09fe543..cf1a9c1 100644
--- a/lib/model/RedirectUrlResponse.php
+++ b/lib/model/RedirectUrlResponse.php
@@ -203,7 +203,7 @@ public function setRedirectUrl($redirect_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundCallback.php b/lib/model/RefundCallback.php
index 9122479..ee52811 100644
--- a/lib/model/RefundCallback.php
+++ b/lib/model/RefundCallback.php
@@ -413,7 +413,7 @@ public function setRefundData($refund_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -425,7 +425,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -438,7 +438,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -454,7 +454,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequest.php b/lib/model/RefundRequest.php
index ad26387..fd67a02 100644
--- a/lib/model/RefundRequest.php
+++ b/lib/model/RefundRequest.php
@@ -359,7 +359,7 @@ public function setRefundData($refund_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -371,7 +371,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -384,7 +384,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -400,7 +400,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequestCustomer.php b/lib/model/RefundRequestCustomer.php
index 510af66..ad06c92 100644
--- a/lib/model/RefundRequestCustomer.php
+++ b/lib/model/RefundRequestCustomer.php
@@ -308,7 +308,7 @@ public function setIdentity($identity)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -320,7 +320,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -333,7 +333,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -349,7 +349,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequestEWalletAccount.php b/lib/model/RefundRequestEWalletAccount.php
index ee9ddbf..3f0f85e 100644
--- a/lib/model/RefundRequestEWalletAccount.php
+++ b/lib/model/RefundRequestEWalletAccount.php
@@ -353,7 +353,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -365,7 +365,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -378,7 +378,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -394,7 +394,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequestMerchantOrder.php b/lib/model/RefundRequestMerchantOrder.php
index e323dff..1e87617 100644
--- a/lib/model/RefundRequestMerchantOrder.php
+++ b/lib/model/RefundRequestMerchantOrder.php
@@ -266,7 +266,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -278,7 +278,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -291,7 +291,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -307,7 +307,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequestPaymentData.php b/lib/model/RefundRequestPaymentData.php
index 8f1dd87..adc2d99 100644
--- a/lib/model/RefundRequestPaymentData.php
+++ b/lib/model/RefundRequestPaymentData.php
@@ -206,7 +206,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -218,7 +218,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -231,7 +231,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -247,7 +247,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundRequestRefundData.php b/lib/model/RefundRequestRefundData.php
index a3ff25e..5d66df1 100644
--- a/lib/model/RefundRequestRefundData.php
+++ b/lib/model/RefundRequestRefundData.php
@@ -242,7 +242,7 @@ public function setCurrency($currency)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -254,7 +254,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -267,7 +267,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -283,7 +283,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponse.php b/lib/model/RefundResponse.php
index 319cac2..e138e78 100644
--- a/lib/model/RefundResponse.php
+++ b/lib/model/RefundResponse.php
@@ -383,7 +383,7 @@ public function setMerchantOrder($merchant_order)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -395,7 +395,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -408,7 +408,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -424,7 +424,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponseCardAccount.php b/lib/model/RefundResponseCardAccount.php
index 8acc960..857501f 100644
--- a/lib/model/RefundResponseCardAccount.php
+++ b/lib/model/RefundResponseCardAccount.php
@@ -361,7 +361,7 @@ public function setMaskedPan($masked_pan)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -373,7 +373,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -386,7 +386,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -402,7 +402,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponseCustomer.php b/lib/model/RefundResponseCustomer.php
index 42fd55b..0bbcaee 100644
--- a/lib/model/RefundResponseCustomer.php
+++ b/lib/model/RefundResponseCustomer.php
@@ -293,7 +293,7 @@ public function setUserAgent($user_agent)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -305,7 +305,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -318,7 +318,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -334,7 +334,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponseEWalletAccount.php b/lib/model/RefundResponseEWalletAccount.php
index f26c6b7..b51db3e 100644
--- a/lib/model/RefundResponseEWalletAccount.php
+++ b/lib/model/RefundResponseEWalletAccount.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponsePaymentData.php b/lib/model/RefundResponsePaymentData.php
index 7bf84c3..d3f2da7 100644
--- a/lib/model/RefundResponsePaymentData.php
+++ b/lib/model/RefundResponsePaymentData.php
@@ -233,7 +233,7 @@ public function setRemainingAmount($remaining_amount)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundResponseRefundData.php b/lib/model/RefundResponseRefundData.php
index 32a5102..f023104 100644
--- a/lib/model/RefundResponseRefundData.php
+++ b/lib/model/RefundResponseRefundData.php
@@ -583,7 +583,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -595,7 +595,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -608,7 +608,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -624,7 +624,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundUpdateRequest.php b/lib/model/RefundUpdateRequest.php
index 8e12eeb..12f41e7 100644
--- a/lib/model/RefundUpdateRequest.php
+++ b/lib/model/RefundUpdateRequest.php
@@ -236,7 +236,7 @@ public function setRefundData($refund_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -248,7 +248,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -261,7 +261,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -277,7 +277,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundUpdateResponse.php b/lib/model/RefundUpdateResponse.php
index a88db8b..c95cd5c 100644
--- a/lib/model/RefundUpdateResponse.php
+++ b/lib/model/RefundUpdateResponse.php
@@ -233,7 +233,7 @@ public function setRefundData($refund_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RefundsList.php b/lib/model/RefundsList.php
index e67c549..68c7a2d 100644
--- a/lib/model/RefundsList.php
+++ b/lib/model/RefundsList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RenamedPlanData.php b/lib/model/RenamedPlanData.php
index 0b5a96e..586aa89 100644
--- a/lib/model/RenamedPlanData.php
+++ b/lib/model/RenamedPlanData.php
@@ -477,7 +477,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -489,7 +489,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -502,7 +502,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -518,7 +518,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Report.php b/lib/model/Report.php
index ed6b924..8227845 100644
--- a/lib/model/Report.php
+++ b/lib/model/Report.php
@@ -507,7 +507,7 @@ public function setWebsiteName($website_name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -519,7 +519,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -532,7 +532,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -548,7 +548,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ReportsData.php b/lib/model/ReportsData.php
index f301e33..712f8a5 100644
--- a/lib/model/ReportsData.php
+++ b/lib/model/ReportsData.php
@@ -266,7 +266,7 @@ public function setStartDate($start_date)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -278,7 +278,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -291,7 +291,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -307,7 +307,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ReportsRequest.php b/lib/model/ReportsRequest.php
index d719571..2befde7 100644
--- a/lib/model/ReportsRequest.php
+++ b/lib/model/ReportsRequest.php
@@ -284,7 +284,7 @@ public function setRequest($request)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -296,7 +296,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -309,7 +309,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -325,7 +325,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ReportsResponse.php b/lib/model/ReportsResponse.php
index 5e49041..46a0958 100644
--- a/lib/model/ReportsResponse.php
+++ b/lib/model/ReportsResponse.php
@@ -323,7 +323,7 @@ public function setSize($size)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -335,7 +335,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -348,7 +348,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -364,7 +364,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Request.php b/lib/model/Request.php
index b96eb96..9c0069f 100644
--- a/lib/model/Request.php
+++ b/lib/model/Request.php
@@ -254,7 +254,7 @@ public function setTime($time)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -266,7 +266,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -279,7 +279,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -295,7 +295,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/RequestUpdatedTransactionData.php b/lib/model/RequestUpdatedTransactionData.php
index a001551..50624d1 100644
--- a/lib/model/RequestUpdatedTransactionData.php
+++ b/lib/model/RequestUpdatedTransactionData.php
@@ -240,7 +240,7 @@ public function setStatusTo($status_to)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -252,7 +252,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -265,7 +265,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -281,7 +281,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ResponsePlanData.php b/lib/model/ResponsePlanData.php
index c547b3e..47a0e54 100644
--- a/lib/model/ResponsePlanData.php
+++ b/lib/model/ResponsePlanData.php
@@ -513,7 +513,7 @@ public function setRetries($retries)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -525,7 +525,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -538,7 +538,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -554,7 +554,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ResponseUpdatedTransactionData.php b/lib/model/ResponseUpdatedTransactionData.php
index f4bc29f..6689968 100644
--- a/lib/model/ResponseUpdatedTransactionData.php
+++ b/lib/model/ResponseUpdatedTransactionData.php
@@ -437,7 +437,7 @@ public function setUpdated($updated)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -449,7 +449,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -462,7 +462,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -478,7 +478,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ReturnUrls.php b/lib/model/ReturnUrls.php
index 6edb109..89a1478 100644
--- a/lib/model/ReturnUrls.php
+++ b/lib/model/ReturnUrls.php
@@ -398,7 +398,7 @@ public function setSuccessUrl($success_url)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -410,7 +410,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -423,7 +423,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -439,7 +439,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ScheduledByMerchantData.php b/lib/model/ScheduledByMerchantData.php
index 5c573a6..9f98d76 100644
--- a/lib/model/ScheduledByMerchantData.php
+++ b/lib/model/ScheduledByMerchantData.php
@@ -640,7 +640,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -652,7 +652,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -665,7 +665,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -681,7 +681,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ScheduledData.php b/lib/model/ScheduledData.php
index 6e355c7..0f8539f 100644
--- a/lib/model/ScheduledData.php
+++ b/lib/model/ScheduledData.php
@@ -646,7 +646,7 @@ public function setTransType($trans_type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -658,7 +658,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -671,7 +671,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -687,7 +687,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ShippingAddress.php b/lib/model/ShippingAddress.php
index 476c760..fb93849 100644
--- a/lib/model/ShippingAddress.php
+++ b/lib/model/ShippingAddress.php
@@ -435,7 +435,7 @@ public function setZip($zip)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -447,7 +447,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -460,7 +460,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -476,7 +476,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/Subscription.php b/lib/model/Subscription.php
index 35e59f2..755bf62 100644
--- a/lib/model/Subscription.php
+++ b/lib/model/Subscription.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionCustomer.php b/lib/model/SubscriptionCustomer.php
index 8c493aa..8bc2640 100644
--- a/lib/model/SubscriptionCustomer.php
+++ b/lib/model/SubscriptionCustomer.php
@@ -233,7 +233,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionFilterParameters.php b/lib/model/SubscriptionFilterParameters.php
index c878d31..3133331 100644
--- a/lib/model/SubscriptionFilterParameters.php
+++ b/lib/model/SubscriptionFilterParameters.php
@@ -670,7 +670,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -682,7 +682,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -695,7 +695,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -711,7 +711,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionGetResponse.php b/lib/model/SubscriptionGetResponse.php
index e6f7165..ae7075a 100644
--- a/lib/model/SubscriptionGetResponse.php
+++ b/lib/model/SubscriptionGetResponse.php
@@ -799,7 +799,7 @@ public function setType($type)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -811,7 +811,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -824,7 +824,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -840,7 +840,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionGetResponsePlan.php b/lib/model/SubscriptionGetResponsePlan.php
index e4ff6b4..fb61b26 100644
--- a/lib/model/SubscriptionGetResponsePlan.php
+++ b/lib/model/SubscriptionGetResponsePlan.php
@@ -203,7 +203,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionList.php b/lib/model/SubscriptionList.php
index 39ec8ec..82c246f 100644
--- a/lib/model/SubscriptionList.php
+++ b/lib/model/SubscriptionList.php
@@ -233,7 +233,7 @@ public function setHasMore($has_more)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionUpdateRequest.php b/lib/model/SubscriptionUpdateRequest.php
index 657f304..469d3a0 100644
--- a/lib/model/SubscriptionUpdateRequest.php
+++ b/lib/model/SubscriptionUpdateRequest.php
@@ -306,7 +306,7 @@ public function setSubscriptionData($subscription_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -318,7 +318,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -331,7 +331,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -347,7 +347,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionUpdateRequestSubscriptionData.php b/lib/model/SubscriptionUpdateRequestSubscriptionData.php
index 76fdf7d..bcc0aec 100644
--- a/lib/model/SubscriptionUpdateRequestSubscriptionData.php
+++ b/lib/model/SubscriptionUpdateRequestSubscriptionData.php
@@ -277,7 +277,7 @@ public function setStatusTo($status_to)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -289,7 +289,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -302,7 +302,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -318,7 +318,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SubscriptionUpdateResponse.php b/lib/model/SubscriptionUpdateResponse.php
index 2adac9e..20c654a 100644
--- a/lib/model/SubscriptionUpdateResponse.php
+++ b/lib/model/SubscriptionUpdateResponse.php
@@ -203,7 +203,7 @@ public function setSubscriptionData($subscription_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -215,7 +215,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -228,7 +228,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -244,7 +244,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/SupportedPaymentMethod.php b/lib/model/SupportedPaymentMethod.php
index 3f04410..5835ac4 100644
--- a/lib/model/SupportedPaymentMethod.php
+++ b/lib/model/SupportedPaymentMethod.php
@@ -233,7 +233,7 @@ public function setName($name)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ThreeDSecureData.php b/lib/model/ThreeDSecureData.php
index 152f7b9..7b67b02 100644
--- a/lib/model/ThreeDSecureData.php
+++ b/lib/model/ThreeDSecureData.php
@@ -410,7 +410,7 @@ public function setXid($xid)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -422,7 +422,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -435,7 +435,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -451,7 +451,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/ThreeDSecureResponse.php b/lib/model/ThreeDSecureResponse.php
index bf0b1b8..00976cc 100644
--- a/lib/model/ThreeDSecureResponse.php
+++ b/lib/model/ThreeDSecureResponse.php
@@ -593,7 +593,7 @@ public function setXid($xid)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -605,7 +605,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -618,7 +618,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -634,7 +634,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/TransactionMethodsList.php b/lib/model/TransactionMethodsList.php
index e113abc..886673b 100644
--- a/lib/model/TransactionMethodsList.php
+++ b/lib/model/TransactionMethodsList.php
@@ -233,7 +233,7 @@ public function setPayoutMethods($payout_methods)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/TransactionRequest.php b/lib/model/TransactionRequest.php
index fb5a980..fb91937 100644
--- a/lib/model/TransactionRequest.php
+++ b/lib/model/TransactionRequest.php
@@ -206,7 +206,7 @@ public function setRequest($request)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -218,7 +218,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -231,7 +231,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -247,7 +247,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/TransactionResponseEWalletAccount.php b/lib/model/TransactionResponseEWalletAccount.php
index a883935..396a7d4 100644
--- a/lib/model/TransactionResponseEWalletAccount.php
+++ b/lib/model/TransactionResponseEWalletAccount.php
@@ -233,7 +233,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/TransactionResponseMerchantOrder.php b/lib/model/TransactionResponseMerchantOrder.php
index 241d6ff..b2ebafc 100644
--- a/lib/model/TransactionResponseMerchantOrder.php
+++ b/lib/model/TransactionResponseMerchantOrder.php
@@ -251,7 +251,7 @@ public function setId($id)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -263,7 +263,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -276,7 +276,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -292,7 +292,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/TransactionUpdateRequest.php b/lib/model/TransactionUpdateRequest.php
index cbcc9fa..aad1360 100644
--- a/lib/model/TransactionUpdateRequest.php
+++ b/lib/model/TransactionUpdateRequest.php
@@ -236,7 +236,7 @@ public function setTransactionData($transaction_data)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -248,7 +248,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -261,7 +261,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -277,7 +277,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/UpdatedPlanData.php b/lib/model/UpdatedPlanData.php
index a640146..cae0557 100644
--- a/lib/model/UpdatedPlanData.php
+++ b/lib/model/UpdatedPlanData.php
@@ -477,7 +477,7 @@ public function setStatus($status)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -489,7 +489,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -502,7 +502,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -518,7 +518,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/UpdatedSubscriptionData.php b/lib/model/UpdatedSubscriptionData.php
index 1219356..18a174c 100644
--- a/lib/model/UpdatedSubscriptionData.php
+++ b/lib/model/UpdatedSubscriptionData.php
@@ -561,7 +561,7 @@ public function setUpdated($updated)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -573,7 +573,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -586,7 +586,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -602,7 +602,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }
diff --git a/lib/model/UpdatedSubscriptionRecurringData.php b/lib/model/UpdatedSubscriptionRecurringData.php
index 4a84a33..019b0b7 100644
--- a/lib/model/UpdatedSubscriptionRecurringData.php
+++ b/lib/model/UpdatedSubscriptionRecurringData.php
@@ -233,7 +233,7 @@ public function setSeparateAuth($separate_auth)
      *
      * @return boolean
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->container[$offset]);
     }
@@ -245,7 +245,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return isset($this->container[$offset]) ? $this->container[$offset] : null;
     }
@@ -258,7 +258,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         if (is_null($offset)) {
             $this->container[] = $value;
@@ -274,7 +274,7 @@ public function offsetSet($offset, $value)
      *
      * @return void
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->container[$offset]);
     }